If it was a cat failure, that should set a code with the high positive fuel trims. I would suspect something like a vacuum leak or anything causing the MAF sensor not to read the air flow. Is it possible for you to screenshot live data of MAF, TPS, MAP, etc sensor readings on idle here? Is your air intake pipe in good condition? Check the additional fittings like hose going to the crankcase, check if the fitting is loose.
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